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Finding the Fourth Proportional to 11,989.40, 18,005.70 and 11,600.60

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Solution

The fourth proportional to 11,989.40, 18,005.70 and 11,600.60 is: 17,421.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,989.40 : 18,005.70 = 11,600.60 : x
  2. Step 2: Convert to fraction form
    11,989.40/18,005.70 = 11,600.60/x
  3. Step 3: Cross multiply
    11,989.40x = 18,005.70 × 11,600.60
  4. Step 4: Simplify right side
    11,989.40x = 208,876,923.42
  5. Step 5: Solve for x
    x = 208,876,923.42/11,989.40
  6. Step 6: Final answer
    x = 17,421.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.